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Liquid crystal composition and liquid crystal display device

a liquid crystal composition and display device technology, applied in the field of liquid crystal composition, can solve the problems of large contrast ratio of the device, short service life of the device, and small electric power consumption

Inactive Publication Date: 2008-09-25
JNC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is about a liquid crystal composition that has a negative dielectric anisotropy. It consists of two components: a first component and a second component. The first component is made up of certain compounds, while the second component is made up of different compounds. The first component can be selected from a group of compounds, while the second component can be selected from another group of compounds. The first and second components can have different structures and can have different properties. The invention also includes a liquid crystal display device that uses this liquid crystal composition. The technical effect of this invention is to provide a new liquid crystal composition that has improved properties and can be used in more advanced liquid crystal display devices.

Problems solved by technology

A large dielectric anisotropy of the composition contributes to a low threshold voltage, a small electric power consumption and a large contrast ratio of the device.
The service life of the device is long when the stability is high.

Method used

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  • Liquid crystal composition and liquid crystal display device
  • Liquid crystal composition and liquid crystal display device
  • Liquid crystal composition and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0094]The composition of Example 1 had a small viscosity as compared to the composition of Comparative Example 1.

2-dhB(2F,3F)-O2(1-1-1)5%3-dhB(2F,3F)-O2(1-1-1)5%5-dhB(2F,3F)-O2(1-1-1)7%3-HdhB(2F,3F)-O2(1-2-1)7%2-dhBB(2F,3F)-O2(1-3-1)6%3-dhBB(2F,3F)-O2(1-3-1)7%4-dhHB(2F,3F)-O2(1-4-1)6%5-dhHB(2F,3F)-O2(1-4-1)6%3-HH-V(2-1)40%3-HH-V1(2-1)11%NI = 73.8° C.;Tc ≦−20° C.;Δn = 0.075;Δε = −3.1;η = 14.8 mPa · s.

example 2

[0095]The composition of Example 2 had a small viscosity as compared to the composition of Comparative Example 1.

2-dhBB(2F,3F)-O2(1-3-1)10%3-dhBB(2F,3F)-O2(1-3-1)10%4-dhBB(2F,3F)-O2(1-3-1)10%5-dhBB(2F,3F)-O2(1-3-1)10%3-HH-V(2-1)49%3-HH-V1(2-1)11%NI = 88.2° C.;Tc ≦−20° C.;Δn = 0.100;Δε = −3.5;η = 15.0 mPa · s.

example 3

[0096]The composition of Example 3 had a small viscosity as compared to the composition of Comparative Example 1.

2-dhB(2F,3F)-O2(1-1-1)5%3-dhB(2F,3F)-O2(1-1-1)5%5-dhB(2F,3F)-O2(1-1-1)5%2-HdhB(2F,3F)-O2(1-2-1)10%3-HdhB(2F,3F)-O2(1-2-1)10%5-HdhB(2F,3F)-O2(1-2-1)10%3-HH-V(2-1)45%3-HH-V1(2-1)10%NI = 70.4° C.;Tc ≦−20° C.;Δn = 0.066;Δε = −2.2;η = 15.5 mPa · s.

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Abstract

A liquid crystal composition having a nematic phase that includes two components, wherein the first component is a specific compound having negatively large dielectric anisotropy, and the second component is a specific two-ring compound having especially small viscosity, and a liquid crystal display device including the composition.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the priority benefit of Japan application serial no. 2007-071992, filed on Mar. 20, 2007. All disclosure of the Japan application is incorporated herein by reference. The entirety the above-mentioned patent application is hereby incorporated by reference herein and made a part of specification.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The invention relates to a liquid crystal composition suitable for use in an active matrix (AM) device, and an AM device containing the composition. In particular, the invention relates to a liquid crystal composition having a negative dielectric anisotropy, and to a device having an IPS (in-plane switching) mode or a VA (vertical alignment) mode containing the composition.[0004]2. Related Art[0005]In a liquid crystal display device, classification based on an operating mode of liquid crystals includes phase change (PC), twisted nematic (TN), super twisted nematic...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09K19/34
CPCC09K19/3402C09K19/42C09K2019/3004Y10T428/10C09K2019/3016C09K2019/3025C09K2019/3422C09K2019/301C09K2323/00C09K19/30C09K19/34G02F1/13
Inventor KIBE, SHIGERUHATTORI, NORIKATSUSAITO, MASAYUKI
Owner JNC CORP
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